Why Rs. 500 notes are losing printing on coming into contact with water?

A preliminary investigation has established that the rush to print the new Rs 500 notes coupled with seemingly reckless operations, including skipping of the vital “colour examination” and “intaglio printing” stages, led to the production of the defective notes. Such notes were given by a bank to one Amarinder Singh of Ashok Vihar Delhi. He had drawn Rs. 25 thousand. He said that his hands were wet when he counted the notes and to his astonishment, the numbers on the Rs. 500 notes were erased.